Rieter

The thread guide

Index

Fitted immediately over the  spindle, the thread guide has to guide the yarn centrally over the center axis of the spindle. The thread guide consists of wire eyelet (o) and thread board (k). The thread guide eyelet is mounted adjustably in the thread board to enable it to be centered. The latter is itself fitted on a continuous thread guide rail (r). The rail can be raised and lowered together with the thread guides. While cops are being wound it performs the same movements as the ring rail, but with a smaller traverse height:

  • continuous raising and lowering during layering and
  • continuous lift by small amounts as switching traverse.

As shown in Fig. 25, this prevents the differences in balloon height between the individual ring rail positions from becoming too large. Otherwise excessive differences in yarn tension would arise, with correspondingly negative effects on ends down frequency and yarn properties. Thread guides must be centered from time to time by means of a pointer (s) fitted on the spindle. Since the thread passes through the inside edge rather than the center of eyelet (o), the tip of the centering pointer must point to the inside edge of the eyelet (Fig. 26).

Fig. 24 – Thread board (k) and thread guide eyelet (o)

Fig. 25 – Raising the thread guide eyelet as the balloon becomes smaller

Fig. 26 – Centering the thread guide eyelet